| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | problem when it [verb] | 17 |
|
| 2 | problem when it [verb] | 13 |
|
| 3 | problem when it [vb -s] | 12 |
|
| 4 | problem when it come | 11 |
|
| 5 | problem when it comes | 8 |
|
| 6 | problem when it [vb past] | 5 |
|
